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diff --git a/mesalib/src/glsl/ir_set_program_inouts.cpp b/mesalib/src/glsl/ir_set_program_inouts.cpp
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+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file ir_set_program_inouts.cpp
+ *
+ * Sets the InputsRead and OutputsWritten of Mesa programs.
+ *
+ * Mesa programs (gl_program, not gl_shader_program) have a set of
+ * flags indicating which varyings are read and written. Computing
+ * which are actually read from some sort of backend code can be
+ * tricky when variable array indexing involved. So this pass
+ * provides support for setting InputsRead and OutputsWritten right
+ * from the GLSL IR.
+ */
+
+extern "C" {
+#include "main/core.h" /* for struct gl_program */
+#include "program/hash_table.h"
+}
+#include "ir.h"
+#include "ir_visitor.h"
+#include "glsl_types.h"
+
+class ir_set_program_inouts_visitor : public ir_hierarchical_visitor {
+public:
+ ir_set_program_inouts_visitor(struct gl_program *prog)
+ {
+ this->prog = prog;
+ this->ht = hash_table_ctor(0,
+ hash_table_pointer_hash,
+ hash_table_pointer_compare);
+ }
+ ~ir_set_program_inouts_visitor()
+ {
+ hash_table_dtor(this->ht);
+ }
+
+ virtual ir_visitor_status visit_enter(ir_dereference_array *);
+ virtual ir_visitor_status visit_enter(ir_function_signature *);
+ virtual ir_visitor_status visit(ir_dereference_variable *);
+ virtual ir_visitor_status visit(ir_variable *);
+
+ struct gl_program *prog;
+ struct hash_table *ht;
+};
+
+static void
+mark(struct gl_program *prog, ir_variable *var, int index)
+{
+ /* As of GLSL 1.20, varyings can only be floats, floating-point
+ * vectors or matrices, or arrays of them. For Mesa programs using
+ * InputsRead/OutputsWritten, everything but matrices uses one
+ * slot, while matrices use a slot per column. Presumably
+ * something doing a more clever packing would use something other
+ * than InputsRead/OutputsWritten.
+ */
+ const glsl_type *element_type;
+ int element_size;
+
+ if (var->type->is_array())
+ element_type = var->type->fields.array;
+ else
+ element_type = var->type;
+
+ if (element_type->is_matrix())
+ element_size = element_type->matrix_columns;
+ else
+ element_size = 1;
+
+ index *= element_size;
+ for (int i = 0; i < element_size; i++) {
+ if (var->mode == ir_var_in)
+ prog->InputsRead |= BITFIELD64_BIT(var->location + index + i);
+ else
+ prog->OutputsWritten |= BITFIELD64_BIT(var->location + index + i);
+ }
+}
+
+/* Default handler: Mark all the locations in the variable as used. */
+ir_visitor_status
+ir_set_program_inouts_visitor::visit(ir_dereference_variable *ir)
+{
+ if (hash_table_find(this->ht, ir->var) == NULL)
+ return visit_continue;
+
+ if (ir->type->is_array()) {
+ for (unsigned int i = 0; i < ir->type->length; i++) {
+ mark(this->prog, ir->var, i);
+ }
+ } else {
+ mark(this->prog, ir->var, 0);
+ }
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_set_program_inouts_visitor::visit_enter(ir_dereference_array *ir)
+{
+ ir_dereference_variable *deref_var;
+ ir_constant *index = ir->array_index->as_constant();
+ deref_var = ir->array->as_dereference_variable();
+ ir_variable *var = NULL;
+
+ /* Check that we're dereferencing a shader in or out */
+ if (deref_var)
+ var = (ir_variable *)hash_table_find(this->ht, deref_var->var);
+
+ if (index && var) {
+ mark(this->prog, var, index->value.i[0]);
+ return visit_continue_with_parent;
+ }
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_set_program_inouts_visitor::visit(ir_variable *ir)
+{
+ if (ir->mode == ir_var_in ||
+ ir->mode == ir_var_out) {
+ hash_table_insert(this->ht, ir, ir);
+ }
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_set_program_inouts_visitor::visit_enter(ir_function_signature *ir)
+{
+ /* We don't want to descend into the function parameters and
+ * consider them as shader inputs or outputs.
+ */
+ visit_list_elements(this, &ir->body);
+ return visit_continue_with_parent;
+}
+
+void
+do_set_program_inouts(exec_list *instructions, struct gl_program *prog)
+{
+ ir_set_program_inouts_visitor v(prog);
+
+ prog->InputsRead = 0;
+ prog->OutputsWritten = 0;
+ visit_list_elements(&v, instructions);
+}